Connection for drill rods



Nov, 11, 1930. s. B. REDFIELD CONNECTION FOR DRILL RODS I Filed Jan. 12, 1929 INVENTOIR. fledj'wid A TTORNEY 5:10 denfl HIS Patented Nov. 11, 1930 UNITED STATE$ mm FEEQE SNOWDEN B. REDFIELD, F EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY CONNECTION FOR DRILL RODS Application filed January 12, 1929. Serial No. 332,129.

This invention relates to core drilling apparatus, but more particularly to a connection for connecting sections of a drill rod together.

a One object of the invention is to enable sections of the drill rod to be readily connected or disconnected. Other objects will be in art obvious and in part pointed out hereina er.

In the drawings illustrating the invention and in which similar reference characters refer to similar parts,

Figure 1 is an elevation partly in section of a core drill bit and the drill rod showing sections of the drill rod connected by a connection constructed in accordance with the practice of the invention,

Figure 2 is an enlarged sectional elevation of the connection, and

Figure 3 is a tarnsverse view taken throu h Figure 2 on the line 33 looking in the irection indicated by the arrows.

Referring to the drawings in which are shown the essential parts of a calyx core drill, A represents a core barrel which is threaded at its rearward end to a head B and at its forward end to a core bit O. The core bit C may be of an cutting an annu ar groove in the material, such as the rock D, to remove a core E therefrom. In the present instance the bit O is provided in its cutting end with teeth F whereby the material is cut.

The means whereby the core barrel is connected to the driving apparatus, such as a rotary drill (not shown) is in the form-of a hollow rod or pipe G preferably formed in sections H and Jv so that as the cutting bit O penetrates the rock, rod sections may be added to those connected with the drill bit. This is considered desirable since it eliminates the necessity of handling rods of excessive length while the drill hole is still shallow or when holes of only small depth are being drilled.

Formerly, in devices of this character, it has been customary to join the various sections of the drill rod together by means. of threaded connection interposed between the sections and, as the drilling progressed, secknown type adapted for tions were added to the main rod by threading other sections to the connection. When the apparatus is in the operative position,

. This obviously entails a considerable loss in time and also adds greatly to the expense of drilling, particularly'where holes of great depth are beingdrilled. The present invention contemplateseliminating the aforesaid objectionable feature in devices of this character, and means are accordingly provided to enable the several sections of the drill rod to be readily coupled together or to be disconnected wheneverit is desired to extend the drill rod or to shorten it. To this end the opposing ends of the rod sections H and J are threaded to accommodate coupling members K and L. The coupling members K and L have passages O therethrough and the outer ends of said passages O are threaded as at P for engagement with the threaded ends of the rod sections H and J. 4

At the adjacent ends of the coupling members K and L are lateral flanges Q and Rrespectivelg.

of lugs which serve as bearings for piv *0 Beneath the flange Q are a serif?- pins T on which are mounted eye-bolts U.

The eye-bolts U are adapted to rockthrough slots V and W in the flanges Q and R respectively and are provided with nuts X which act against the flange R for drawing the coupling members K and L together.

In apparatus of the type to which the invention pertains the elements which connect the cutting bit with the driving apparatus are subjected to great strains. It is therefore essential that they be sufliciently rugged to withstand any strain to which they the assembled position, there "vmay be subjected so that the cutting. element may not become lost in the drill hole. In View of this consideration means are provided for protecting the bolts U against any shearing action which might otherwise take place between the flanges Q, and R, the objectbeing that the only function of the "bolts U will be to clamp the coupling members together. To this end thecoupling member K is provided itha slot Y which extends across the end 'f'ac'e of? the member K adjacent the flange Q and is of a Width somewhat Wider than the diameter of the passage 9. The coupling member L carries a projection Z which extends slidably into the slot Y. The

projection engages the side wallsot the slot and .acts as a key for holding the members It; and L securely against any form of relative rotary movement. I 2'0:

Inorder to seal the connection the member K s provided "with an annular recess 6 to receive a packing, as for instance, agaslret c which, when the nuts Y. are tightened on the boltsU Wlll bexcomnressed bv a boss 05 on the member Lwhich extends into the recess 1) and serves to centralize the members K and L with respect to each other.

In practice after the drill rod sections such as H and J, have been provided with the coupling'meinbers K and lo, the drill rod sections may be brought together endvrise in such manner that the projection Z may be niovedinto engagement with the slot Y, the bolts U may then be rocked into the operative position and the nuts X tightened, to

clamp the rod sections securely together,

Damn the ooeration of the device, the l I 1 thrust between the sections or o it rod will be transnitted from the oroiection Z to the side Walls of relative.- movement between these members andtherefore the bolts J- Wlil be protected against. any strains other than that of hold- 1.;ingthe' :rnembers together.

on the other member extending into the siot and engaging the side Walls of said slot to prevent relative rotation between the mesa bers, a recess in one member, a boss on the other member extending into the recess tocentralize the members with respect to each other, and means for clamping the members together.

2. A connection for drill rods, comprising a pair of members adapted for connection to sections of a drill rod, oneof said members having a slot across one end and an annular recess, a packing in the recess, a projection on the other member extending slidably into the slot andengagingthe side Walls of said slot to prevent relative rotation between the members, a boss on the projection bearing against the packing and extending into the recess to hold the members in coaxial relationship, and means for clamping the members together and for compressing the packing.

3. A connection for drill rods, comprising a pair of sections, lateral flanges on the sections having radial slots, said members having passages therethrough, threads in the passages for threaded connection With sections of a drill rod, one of said members having a slot across one end and an annular recesaa packing in the recess, a projection on the other member extending slidably into the slot to engage the side Walls of said slot to prevent relative rotation between the members, a boss on the projection bearing against the packing and extending into the recess to hold the members in coaxial relationship, eye-bolts pivoted on one flange and adapted to lie in the radial slots, and nuts on the eye bolts for clamping the members securely together and-for compressing the packing.

In testimony whereof I specification.

SNOWDEN B. REDFIELD.

have signed this mil 

